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A field experiment was conducted to determine the effects of different organic residues (OR) (e.g., wheat straw corn straw and tobacco residues) on nitrogen mineralization and denitrification loss using application rates recommended to local farmers. | Turk J Agric For 26 (2002) 349-353 © TÜB‹TAK The Effect of Wheat Straw, Corn Straw and Tobacco Residues on Denitrification Losses in a Field Planted with Wheat Ali COfiKAN, Mustafa GÖK, Ifl›k ONAÇ Çukurova University, Agriculture Faculty, Soil Science Department, Adana - TURKEY ‹lker ‹NAL, Turan SA⁄LAMT‹MUR Çukurova University, Agriculture Faculty, Horticulture Department, Adana - TURKEY Received: 02.09.2002 Abstract: A field experiment was conducted to determine the effects of different organic residues (OR) (e.g., wheat straw corn straw and tobacco residues) on nitrogen mineralization and denitrification loss (N2O-N) using application rates recommended to local farmers. Nitrate and ammonium analyses were carried out on periodically collected soil samples. In-situ denitrification loss was determined using the acetylene inhibition technique (AIT). The results revealed that OR application increased N mineralization significantly. In the favorable conditions for nitrification and intensive mineralization period, NO3 -N accumulation at 0-60 cm depth -1 peaked at 163.0, 177.7 and 226.6 kg N ha in plots with wheat straw, corn straw and tobacco waste, respectively. In-situ denitrification measurements showed that intensive mineralization, depending on temperature and humidity conditions, significantly increased denitrification losses. The denitrification values measured showed a variation between 7.58 and 17.40 kg N2O-N ha-1. The results also showed that the effect of organic substrates on N loss via denitrification was highly dependent on the type of organic substrate used, and the C/N ratio of the organic substrate played an important role in N loss by denitrification. Key Words: Wheat straw, corn straw, tobacco waste, denitrification Bu¤day An›z›, M›s›r Sap› ve Tütün At›¤›n›n Bu¤day Vejetasyonu Alt›nda Toprakta Denitrifikasyon Kayb›na Etkisi Özet: Bu çal›flma, bu¤day an›z›, m›s›r sap› ve tütün at›¤› gibi çeflitli organik art›k ve at›klar›n uygulama koflullar›nda
